Automatically-threading shuttle for looms



1 May 927 H. A. DAVIS AUTOMATICALLY THREADING SHUTTLE FOR L00 Filed Oct. 14, 1926 Patented May 31, 1927.

UNITED STATES 1,631,089 PATENT OFFICE.

HARRY A. DAVIS, 01 HOPEDALE, MASSACHUSETTS, ASSIGNOB TO DRAPER CORPORA- TION, OF HOPEDALE, MASSACHUSETTS, A' CQRPORATION OI MAINE.

AUTOMATICALLY-THREADING SHUTTLE FOR LOOKS.

Application filed October 14, 1926. Serial No. 141,520.

This invention relates to automatically threading shuttles for looms wherein the shuttle becomes threaded after replenishment of filling or after an overthrow with- 5 out removal of the shuttle from the loom and is in part a continuation of and sub stitution for a prior application, Serial No. 79,990, filed January 8, 1926, which has been abandoned,

Automatically threading shuttles, as'heretofore constructed, have usually been pro-' vided with a threading block having an apron, usually overhanging the side delivery eye and terminating at its forward end in a thread director for directing the thread to the side delivery eye during complete threading of the shuttle. During weaving, the shuttle is subject to the main binder pressure, as it enters the shuttle box, at the breast portion of the shuttle; that is, at a point laterally opposite the threading block and substantially near the rear end portion of the block, and it has heretofore been the practiceto maintain as much strength as possible at the breast of the shuttle to prevent cracking or breaking the shuttle wood.

The effect of these two conditions has resulted in the formation of obstructions or shoulders, either in the shuttle body or the apron of the threading block where these two parts come together. In weaving with a narrow open shed, the warp threads in the upper plane of the shed, frequently ride over in contact with the front wall of the shuttle, with the result that the shoulders or projections formed at the union of the shuttle body and the apron of the threading block frequently break the warp threads in the upper plane of the shed and necessitate stopping the loom. This is particularly observable in the use of the automatically threading shuttle in looms with narrow open shed, because, as the shuttle enters the shed, the threads in the up er plane of the shed are en untered first l y the end portion of the sh ttle slightly back of the tip thereof, and such threads then ride along the surface of thei front wall of the shuttle and upon encoun'tering projections or shoulders or other obstructions between the shuttle body and the apron of the. block, suchthreads catch and become broken.

The objeot of the present invention, therefore, is to providean automatically threading shuttle having its front wall, which is adjacent the fell of the cloth during weavas it passes through the ing, cut away in a frontward and forward uniformly curved surface from a point back of the shuttle breast to a point forward. of the side delivery eye, and associating therewith a threading block wherein the apron is provided with a similar frontwardly and forwardly extending surface corresponding to the plane of the curved surface of the front wall of the shuttle body, thereby doing away with all projections or obstructions that would be liable to break the warp threads in the upper plane of the shed.

In accordance with the present invention, the front wall of the shuttle body is rounded 7 and uniformly curved in a frontwardly, downwardly and forwardly direction towards the end of the shuttle and the apron of the threading block is similarly curved frontward, downward, and forward in the same plane as the curve formed in the shut tle body, so that the surfaces presented to the warp threads in the upper plane of the shed merge into each other without offering obstructions or sudden lifting projections to the overriding warp threads, and in order to support the wood of theshuttle at the shuttle breast, the threading block is formed of a non-yielding material such as cast iron or the like. The result of this combination is that the non-yielding threading block at the inside portion of the shuttle adj aoent the shuttle breast lends an effective support to the shuttle at this point where the greatest crushing strain is exerted upon the shuttle as it is arrested in the shuttle box.

The invention will best be made clear from the following description and the accompanying drawings of one good practical form thereof.

In the drawings:

Fig. 1 is a side elevation of an automatically threading shuttle provided with the present invention;

Fig. 2 is an enlarged perspectiye view of such a shuttle showing the merging of the uniforml curved surfaces of the shuttle wood an surface of the apron;

Fig. 3 is a sectional elevation through the lay, with parts broken away, showing a .nar- 105 row open shed with'a shuttle of the present invention employed in connectlon therewith;

Fi 4 is a diagrammatic view, showing the t reads in the upper plane of the shed wall of the shuttle no shed; and v Fig. 5 ,is a plan viewof the threatdmg bearing upon the front of a shuttle containingthe present invention.

The shuttle body 1 is formed of wood, as usual, and is provided with the usual bobbin chamber 2, the bottom of which is open for the ejection of a spent filling carrier during replenishment of filling. Forward of the bobbin chamber 2 the shuttle is provided with a threading block receiving chamber 3 in which is supported the threadin block 4 which, as shown, is of the threa casting type, similar in this respect to the shuttle shown and described in the patent to Edward S. Stimpson, No. 1,309,226, July 8, 1919. The threading block 4 has the longitudinally extending thread passage and the thread casting scroll 5, which, on the formation of a loop or overthrow as the shuttle is brought to rest in the replenishing box, casts the thread upwardly out of the longitudinally extending thread passage. During weaving, the thread passes through the scroll 5, over the bridge 6, and then is turned laterally through the side delivery eye 7. The front wall 8 of the shuttle 1 which is adjacent the fell of the cloth during weaving, is cut away from the point 9 which is back of the shuttle breast 10, and such cut away portion of the shuttle wood extends frontwardly, as at 11, (indicated in Figs. 1 and 2) and downwardly and forwardly, in a uniform curve to the end portion 12 of the shuttle. The curved portion formed in the wall of the shuttle body is uniform from end to end and from top to bottom, with the result that a smooth, gradual, warplifting and sliding surface is presented to the warps in the upperplane of the, shed during weaving.

The threading block 4 is provided with an apron 13 overhanging the side delivery eye 7, and the exterior surface of the apron 13 has likewise a frontwardly, downwardly and forwardly extending surface 14 in the plane of the surface formed in the front wall of the shuttle wood, the result beingthat as the warp threads 0 (as indicated in Figs. 3 and 4) ride over and are lifted by the forwardly-inclined surface 12 of the shuttle wood, they pass alon the correspondingly curved surface 14. o

the threading block apron without meeting any obstruction or projection tending to break .the warp threads, and, similarly, as the warp threads pass from the surface 14 of the apron on to the shuttle" wood adjacent the breast of the V shuttle they ride upon the correspondingly curvedsurfaceformed in the wall of the shuttle wood, until, finally, when they pass on to the curved surface of .the shuttle wood between the breast of the shuttle at IO and the end of the curved portion of the shuttle body at 9, they are finally lifted sufiiciently to permit the shuttle to pass through the shed without danger of breaking or ruptursurface of the front wall of the shuttle and the apron, is flush, or coincides with the curve of the shuttle wood and apron, so that no projection is formed at this Point calculatedv to catch or break the warp threads. Likewise, the forward edge 16 of the. apron which merges into the curve of the shuttle Wood in front of the side delivery eye, presents no obstruction to the free passage of the warp threads as the shuttle passes through the shed.

As indicated in Figs; 3 and 4, the warp threads are gradually lifted as the shuttle passes through the shed and, as indicated more particularly in. the diagrammatic view, Fig. 4, the warp threads bear upon the leading or forward curved portion 12 of the shuttle wood and pass on to the similarly curved portion of the apron 13, and from thence pass on to the similarly curved portion of the shuttle wood adjacent the breast 10 of the shuttle and to the beginning of the cutaway portion .of the shuttle wood at 9, without 'at any 1 time being subjected to an abrupt lift calculated to break the warp obstruction between the apron. of the threading threads, or to an shuttle wood an block.

As indicated in Fig.1, the frontwardly, downwardly and forwardly inclined surface 4 formed in the shuttle wood has its top por-' tion below the back wall 17 of the shuttle body, so'that as the shuttle enters the shed, the front wall thereof may gradually lift wall of the shuttle.

' The cutting away of the shuttle wood to fotrm the gradual curvafture described is liable to detract from the desired strength of the shuttlewhere the binder pressure .is most effective as the shuttle is arrested'in of the shuttle being crushed or broken under the binder pressurethe threading block is formed of non-yielding material which effectively supports the wood of the shuttle and may be of the general characterof the threading .block shown and described in the patent to Edward. S. Stimpson, No. 1,538,224, May '19, 1925. As indicated in Fig. 5, it will be noted that the side. wall 18 of the threading block lies inside of the front wall of the shuttle, and being formed of non-yielding material, such as cast iron".

the warp threads in the upper plane of the shed with an easy, gradual, rising motion,

ack of-such end 9, which is the shuttle box and to overcome .any liability frontwardly, downwardly and forwardly uniformly curved surface from a point back of the shuttle breast to. a point forward of the side delivery eye, and a threading block the side Walls of which are laterally unyielding to compensate for and support the weakened front wall of the shuttle to pre vent breakage of the shuttle wood under the binder pressure and having an apron provided with a frontwardly, downwardly and forwardly extending curved surface in the same plane as the curved surface ofthe shuttle wall that the warp threads in the upper plane of the shed may ride over the coinciding curved surfaces of the shuttle wall and apron without encountering any obstruction from either. i

- 2. In an automatically threading shuttle for looms, the combination of the shuttle body providedwith a side delivery eye and having its front wall adjacent the fell of the cloth during weaving cut away in a frontwardly, downwardly and forwardly uniformly curved surface to a point frontward of the side-delivery eye and the top of which curved surface gradually decreases in height relative to the back wall of the shuttle, and a cast iron threading block which supports the front wall of theshuttle against the binder pressure and having an apron with a similarly curved surface that the warp threads in the upper plane of the shed may be gradually lifted by the coinciding curved surface Without obstruction as the shuttle passes through the shed.

3. In an automatically threading shuttle for looms, the combination of the shuttle body provided with a side delivery eye and having the wood of the front wall of the shuttle adjacent the fell of the cloth during weaving rounded into a frontwardly, downwardly, and forwardly extending direction from a point back of the shuttle breast to a point forward of the side delivery eye to form -a uniformly curved surface between these points devoid of projections that the warp threads in the upper plane of the shed Y may ride over such surface without being broken when the shuttle is used in a narrow open shed, and a cast iron threading block having its unyielding-wall underlying the wood of the shuttle breast to support the same and prevent injury to the shuttle under the binder pressure.

In testimony whereof, I have signed my name to this specification.

HARRY A. DAVIS. 

